NXP Semiconductors 74LV251D,112

Overview

74LV251D,112 from NXP Semiconductors (formerly Philips) is an 8-input CMOS multiplexer with true/complement 3-State outputs, operating from 1.0 V to 3.6 V supply, featuring 19 ns propagation delay (Sn→Y at VCC = 3.3 V), 3.5 pF input capacitance, and –40°C to +125°C industrial temperature range - used in digital signal routing for programmable logic and bus interface systems.

For engineers reviewing the 74LV251D,112 datasheet, 74LV251D,112 pinout, 74LV251D,112 application, or 74LV251D,112 equivalent, key selection criteria include low-voltage compatibility (1.0–3.6 V), dual active-high/active-low outputs, 3-State expansion capability, and pin/function compatibility with 74HC/HCT251 for legacy design migration.

Technical Context

The 74LV251D,112 implements a single 8:1 data selector using Si-gate CMOS technology, with three binary select inputs (S0–S2) decoding one of eight data inputs (I0–I7) to both Y (true) and Y (complement) outputs. Output enable (OE, active LOW) places both outputs in high-impedance state, enabling cascaded multiplexer architectures.

It supports TTL-level inputs when VCC ≥ 2.7 V, exhibits ground bounce < 0.8 V and VOH undershoot > 2 V at 3.3 V, and delivers standard-output drive (±6 mA at VCC = 3.0 V), with quiescent ICC ≤ 160 µA across full temperature range.

Key Specifications

Pinout & Package

74LV251D,112 is supplied in a 16-pin plastic SO package (SOT109-1), 3.9 mm body width, with standard DIP-compatible footprint and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-input multiplexer applications.

Compared with 74LV251D,112, the 74LVC251PW,118 trades extended temperature support for higher speed and lower quiescent current, while the SN74LV251APW provides identical performance and qualification with alternate supply-chain provenance.

Availability

74LV251D,112 is available at Aetrix Electronics and suitable for industrial control systems, automotive diagnostics, programmable logic interfaces, and legacy voltage translation requiring stable component supply across long product lifecycles.

Supply support for 74LV251D,112 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader delivering high-performance mixed-signal and RF solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering logic portfolio.

The 74LV251D,112 belongs to NXP's legacy LV (Low-Voltage) logic family, designed specifically for robust, low-power digital signal routing in mixed-voltage embedded systems where reliability across wide temperature ranges is critical.

FAQ

What is the maximum operating frequency supported by the 74LV251D,112?

The 74LV251D,112 does not specify a maximum clock frequency directly, but its propagation delay (Sn→Y) is 19 ns typical at VCC = 3.3 V, implying a theoretical maximum toggle rate of ~26 MHz for select-input-driven switching. Actual usable frequency depends on input rise/fall times, load capacitance, and system timing margins - design validation with worst-case AC characteristics is required.

Can the 74LV251D,112 operate reliably at 1.2 V supply voltage?

Yes, the 74LV251D,112 is fully specified down to VCC = 1.2 V per its Recommended Operating Conditions, with guaranteed VIH/VIL thresholds and functional operation. DC characteristics are validated from 1.2 V to 3.6 V, and propagation delays remain within datasheet limits - making it suitable for ultra-low-power battery-operated systems.

Is the 74LV251D,112 pin-compatible with the 74HC251?

Yes, the 74LV251D,112 is explicitly stated in its datasheet to be pin and function compatible with the 74HC/HCT251. All 16 pins match in location and logical behavior, including identical I0–I7, S0–S2, Y/Y, OE, VCC, and GND assignments - enabling direct replacement in existing 74HC251 layouts without PCB modification.

Does the 74LV251D,112 require external pull-up resistors on its inputs?

No, the 74LV251D,112 has no internal pull-up or pull-down resistors on any input (I0–I7, S0–S2, or OE). All inputs are CMOS high-impedance and must be actively driven to defined logic levels; floating inputs may cause increased ICC, noise susceptibility, or undefined output states - external termination is required only if system topology demands it.

What is the meaning of "Y" and "Y" outputs on the 74LV251D,112?

The 74LV251D,112 provides both true (Y) and complement (Y) outputs simultaneously. When a selected input (e.g., I3) is routed through, Y outputs the unmodified logic level while Y outputs its inverse - both outputs share the same 3-State control via OE. This eliminates need for external inverters in applications requiring differential signaling or logic-level inversion.